I made a simple surge arrestor using 220 Volt MOV's . This is for a desktop computer. As I live in a country with power cuts of up to 15 hours a day I have a modified sine wave inverter to run the computer when the power goes.

The system in the Inverter has an automatic transfer switch so we have uninterrupted power. Since I put the surge arrestor into the circuit the computer switches off as soon as the power goes.

Is there a conflict between modified sine wave inverters and 275 Volt 10mm MOV's

I made a simple surge arrestor using 220 Volt MOV's . This is for a desktop computer. As I live in a country with power cuts of up to 15 hours a day I have a modified sine wave inverter to run the computer when the power goes.

The system in the Inverter has an automatic transfer switch so we have uninterrupted power. Since I put the surge arrestor into the circuit the computer switches off as soon as the power goes.

Is there a conflict between modified sine wave inverters and 275 Volt 10mm MOV's

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You need MOVs rated at least 275VAC, some manufacturers are very confident of their designs and install MOVs rated as high as 1100V!

Every time an MOV catches a surge event - it takes a hit. Some times they chimble away round the edges, sometimes they shatter completely.

AFAIK; Sidac diodes are like super power diacs - they switch to fully conducting at their rated breakover voltage. So adding sidacs as well as MOVs but at a higher breakover voltage than the MOV - a good MOV should clamp any spikes before they trip the sidac, as the MOV gets weaker - a spike will trip the sidac which blows the fuse, then you know its time to fit new MOVs.